It is defined as the chemical elements and compounds
that are necessary for plant growth and
development also of their external
supply and internal metabolism. In 1972 according to E. Epstein two criteria
for an element to be essential for plant growth:
1.
in its absence the plant is unable
to complete a normal life cycle; or
2.
that the element is part of some
essential plant constituent or metabolite.
This is in accordance with Liebig's
law of the minimum.There are 14 essential plant
nutrients. Carbon and oxygen are absorbed from the air, while other nutrients
including water are obtained from the soil.
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